Have you already started applying or were you going to wait for your score?
I think I would retake it - I think the 6 might hurt you a bit. I can't remember which school, NYU I think, that stated it highly recommends strengthening credentials if scores below 10 on the science sections are received. And I know someone who got a 6 in verbal last year who did not get in and when he asked them, they told him they thought his score was low and that he should retake it.
It's hard to say... some schools might not mind so much. If you have already started applying, I would try looking into the details of each school and maybe narrow it down to a few select schools to apply to so you don't have to squander your hard-earned dollars. In the meantime, you might want to start preparing for the April exam.
Just my opinion, good luck!